My son's new Archos 70 arrived and he's thrilled with it. Having used my HTC Desire he is aware of the Android Market and I said that I would put it on for him. I followed a video from YouTube by the Digital Digest and all went beautifully. He had gone to bed by the time I had finished so when the Market showed up in the Apps I thought that I would sign in just to test that it worked. Wrong move! It immediately started syncing and has downloaded all my phone contacts, my calendar and goodness knows what else. Obviously he has no use for these. I have turned off sync to my Google Account and have added his account. What is the safest way to delete all my data? I realise that I can reset the Archos to factory settings but he has already started setting it up so would like to avoid that if I can. Any help appreciated!